\begin{denotation}
\songti \zihao{5}
%\songti \zihao{5}
\begin{center}%此处最好是h
\arrayrulewidth1pt
\resizebox{\textwidth}{!}{
\begin{tabular}{| m{0.4\textwidth}<{\centering} | m{0.3\textwidth}<{\centering} | m{0.3\textwidth}<{\centering} |}
\hline
符号&意义&单位（量纲）\\
\hline
频率&赫[兹]&Hz\\
\hline
\end{tabular}}
\end{center}
\end{denotation}
